Created the project to generate the Win8.1+WinPhone 8.1 universal binaries
The Facebook Authentication for WinPhone 8.1 app works. However, on WP8.0, the SDK relied on elements being present in WMAppManifest.xml. Since in 8.1 this is not present, a new scheme has been designed. It is assumed that a XML file FacebookConfig.xml will be present in the application root folder containing the requisite elements
The way the redirect back from Facebook app is handled has changed in WP8.1. The app must trap the OnActivated event handler and parse the URI from IActivatedEventArgs.
Documentation on the website needs to be updated
The UI controls - Login, Photo Picker, Place Picker and Friend Picker have not yet been tested on Windows Phone and are unlikely to work at the moment.